India has conveyed its concern to Bangladesh over a terror threat to Chief Executive Officer Richard Larison and nine Indian doctors of Dhaka-based Apollo Hospital and asked it to ensure security for them.

External affairs ministry called Bangladesh High Commissioner Liaquat Ali Choudhary in Dhaka Friday to convey its concern in the wake of the threat received through an e-mail a few days back, sources told PTI in Dhaka Saturday.

The Ministry of External Affairs is also understood to have asked the Bangladeshi government to provide adequate security to the threatened people and the hospital located at Basundhara, a diplomatic enclave near Dhaka, they said.

Larison and nine doctors were threatened via e-mail sent by a person identifying himself as Abu Sayeed M M Rehman, joint secretary of Joint Action Committee of a three-member group of terror outfits -- Jamait-ul Mujahideen, Harkat-ul-Jehad-e-Islami and Jagrata Muslim Janata Bangladesh.

The e-mail asked them to leave the country or pay 20 lakh taka (Bangladeshi currency), the sources said.

Dhaka has conveyed to New Delhi that the threat was believed to be a hoax, but they were investigating the matter and security has been provided to the hospital and the threatened persons.